The Ultimate Lab Glassware set includes 6 pieces of glassware. 100ml & 250ml beakers, 50ml & 100ml measuring cylinders, 250ml Erlenmeyer flask and a Class-A 50ml burette with PTFE stopcock and blue graduations. Made of high quality, heavy duty, 3.3. Borosilicate glass. Thick, uniform walls provide excellent strength against breakage. Designed for use in professional laboratories, but is ideal for classroom use. Set is packaged in a custom fit, thick foam casing, for safe storage and worry free transport.